Just needing to vent....

My husband and I have been together since we were 15. We were head over heels almost immediately. When I was 16 I was diagnosed with PCOS. My Dr started me on metformin and Spironolactone to help with the symptoms and for weight loss. When we were 17, I stopped using birth control and condoms. My periods stopped and after 6 months I went to my Dr. He referred me to a fertility specialist and when I was 18 I was diagnosed with non classic CAH. We have been ttc for baby #1 for 4, almost 5 years. We just started fertility treatments in October and we have done 3 cycles of Letrozole 2.5mg, I had a chemical pregnancy in November and I am now on my first cycle Letrozole 5mg. I’m trying to stay positive and open minded but it’s just so hard. I see girls on here who are frustrated after 3 months of ttc or who get pregnant on their first try and it’s really hard to stay positive. I try to be happy for others but it’s really hard and I feel selfish....When will it be my turn😔😔